[8u] API Request: RT-25613, ObservableValue should have a hasListener(listener) method

Tom Schindl tom.schindl at bestsolution.at
Wed Jan 22 04:47:09 PST 2014


> Actually even when you would rely on the order, in situations when you
> call ensureListener, you don't really know if the listener is already
> there. So you might really expect that listener would be added at this
> point as the last. It's just that will always be the outcome if the
> default implementation is used.

It would be even worse if this would be different in none default


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